Dinitro monoazo compound



l atented July 5, 1949 UNITED STATES ATENT OFFICE DINITRO MONOAZO COMPOUND No Drawing. Application July 27, 1943, Serial No. 496,338. In Switzerland August 10, 1942 1 Claim.

It has been found that valuable azo-dyestufis are obtained by coupling diazotized l-amino- 3:5-dinitrobenzene compounds with amines of the benzene series which are capable of being coupled. The capability of coupling of these amines is determined by the presence of an amino group which may be primary, secondary or tertiary.

Among the 1-amino-3:5-dinitrobenzene compounds there may be named the following: 1-amino-3;5-dinitrobenzene itself, l-amino-lmethyl-3 -dinitrobenzene, 3:5-dinitrobenzene, l-amino-4-methoxy-3z5 dinitrobenzene, 1-amino-4-ethoxy-3 S-dinitrobenzene, and the like.

Particularly valuable are the dyestuffs obtained with amines free from nuclear, sulfo or carboxylic groups. If these amines are actually free from solubilizing groups, such as sulionic groups and carboxylic groups, ther are obtained Waterinsoluble dyestufis which are soluble in organic liquids such as acetic acid ethyl ester and which may be used for dyeing esters and ethers of cellulose, for example textiles consisting of acetyl cellulose, further for dyeing textiles composed of superpolyamides or urethanes, and for dyeing artificial masses, lacquers, varnishes and other articles made from such products. Further, When coupling thes diazotized 1-amino-3:5-dinitrobenzene compounds with amines in which the amino group is substituted by radicals which contain a solubilizing group, for example a sulfonic acid group, there are obtained soluble dyestufis which are suitable for dyeing and printing the above mentioned textile fabrics, further in some cases also for dyeing and printing animal fibres.

Among the amines coming into consideration as coupling components there may be mentioned: aminobenzene, Z-methylaminobenzene, 3-methylaminobenzene, 2-methoxyaminobenzene, 3- methoxyaminobenzene, B-acetylaminoaminobenzene, 3-methyl-G-methoxyaminobenzene, further also such aminobenzenes which contain as substituents in the amino group at least one alkyl radical or a hydroxy-alkyl radical or an esterified or etherified hydroxyalkyl radical, viz. for example monoand dialkylaminobenzenes, such as VII. NO:

NHr

l-amino-Z-methyl- I 5 formulas:

II. NO: 0 CH3 NO, 0 CHa III.

V. N O z I O 2N 8 011 CH be No, (1115 T 2 CHr-CHz-OH VI. III 0:

CHg-CHz-OH Vin.

/CH: N=N N\H N02 Ha 1x. NO:

I CH1 7 omo v n N\ x om-on-om-on CH CHHOH llg i sti fi w ic maya s lbeused o dyein t a e vena ed z-a fi ia lfl e l ca iu the b o sine whe us ng;-as..q 11n in mmp n nt th ste 1 tm yba i acids .Q s c v-e k m nnbenzenes which contain an OH-group in the alkyl radical, that is to say for example the sulfuric acid ester of N-methylhydroxyethyl-B-methylaminobenzene. ,Esters of organic dicarboxylic acids and sulfoearboxylic;acidsi may also be used, viz. compounds described in U. s-vpatent applications Serial No. 239,404, filed July :8, 1938, (now U. S. Patent No. 2,354,187, granted .July 25, 1944) and No. 443,62 I f 11ed May 19, 19 42 (now U. S. Patent 2-;361,61'8, granted octoher..l. 1944) and in U. S. Patent-No. 2,283,321. jI'hus there are obtained dyestufisiior example oi' the formulas:

| QEa-Q N=N N\ om-om-o-o-omori-ooon NO:

XIV.

No, OCH;

| CHi-CHhO-SOgH N=N N\ OH: NO; CH:

eta-enroll, OHaO- N=N -N N02 CHQ-CHrQJ -UH -S & CHa-CHa-O-C-COOH a ll OKs-CH3 COOH XXI.

XX'II. 7 N02 TT {CHrr-QiHz-QfiSQJK etq- .wh ch q n o i outs als b b ne in h a ma ne a th v y ii l n the e e q n para rap ar t ea d. a es r. i ict ed" in e t it ...e eri n a nts such a oxalicaoid maleic agid; maleic acid anhydride, succinic acid anhydride sulfuric acid, sul fochloroaceticacid, and the like. It isnot" necessary at all' that the I atom groupingimparting solubility be bound to the alkyl radical in the'form of an-ester; sugh allg-yl radicals; come alsp'into consideration which are linked directlyat ,thesuifo' or carbog-yi groups, as can' be seen in the foregoing formulae;

The new products represent therefore new az odyestufis of" the general "formula:

smupqqmsifi z il m elder-seen etemsssns and substituted alkyl radicals, and R2 stands for a member ofthe group consisting of hydrogen atoms and alkyl and substituted alkyl radicals.

The-f01lowing examples illustrate the invention, but are not to be regarded as limiting it in any way, the parts being by weight:

Example 1 18.3 parts of 3:5-dinitroaminobenzene are dissolved in 150 parts of hydrochloric acid of 30 per cent strength by heating. The solution is cooled by addition of ice and the cold suspension is mixed, While stirring, with a solution of 7 parts of sodium nitrite in about parts of water.

A solution .of 20.9 parts of the sodium salt of aniline-w-methanesulfonic acid in 200 parts of water is prepared and about 200 parts of sodium acetate are added thereto. This suspension is mixed with the diazo solution and stirring is continued until the formation of dyestufi is complete. The dyestufi is filtered and washed until neutral. It is then stirred in about 500 parts of water and heated with 25 parts of sodium hydroxide solution of per cent strength to -60 C. until it is clearly soluble in acetic acid ethyl ester. The w-methanesulfonic acid radical is then split ofi. The dyestuff which corresponds to the foregoing Formula I is now filtered and washed until neutral. When dry it is an orange red powder dissolving in organic solvents to a yellow solution and dyeing acetate rayon from a fine suspension fast yellow tints.

The procedure is similar with the diazo solution of 1-amino-4-methyl-3:5-dinitrobenzene and a similar dyestufi is obtained with aniline when working in similar manner. When using 1-amino-3:5-dinitro-4-methoxybenzene, a dyestufi is obtained which dyes similar tints.

Instead of aniline also 3-methylaminobenzene can be used, in which case this base can be used directly.

Dyestuffs can also be obtained when using for example N-ethyl-hydroxyethylaminobenzene or N-dihydroxyethylaminobenzene instead of the indicated bases. When coupling these diazo compounds with the oxalic acid ester or the maleic acid ester of N-methylhydroxyethylaminobenzene, there are formed dyestufis which dye acetate rayon from aqueous solutions yellow to orange tints.

Example 2 18.3 parts of 3:5-dinitroaminobenzene are dissolved in 150 parts of hydrochloric acid of 30 per cent strength by heating. The solution is cooled by addition of ice and the cold suspension is mixed, while stirring, with a solution of 7 parts of sodium nitrite in about 25 parts of water.

A solution of 18.1 parts of dihydroxyethylaminobenzene in 50 parts of water and 50 parts of 2N hydrochloric acid is now prepared. This solution is mixed with the diazo solution and the formation of dyestuff is completed by the addition of about 200 parts of sodium acetate. The dyestufi is filtered and washed until neutral. It corresponds to the formula:

I CHz-CHr-OH CHz-CHr-OH OzN' and dyes acetate rayon reddish orange tints.

Example 3 18.3 parts of 3:5-dinitroaminobenzene are dissolved in 150 parts of hydrochloric acid of 30 per cent strength by heating. The solution is cooled by addition of ice and the cold suspension is mixed, while stirring, with a solution of '7 parts of sodium nitrite in about 25 parts of water.

A solution of 30.75 parts of the chlorosulfoacetic acid (phenyl-methyl-amino) ethylester (obtained by heating-15.1 parts of methyl-hydroxyethyl-aminobenzene and 26.2 parts of chlorosulfoacetic acid in solvent naphtha to C.) in 200 parts of water is now prepared. This solution is mixedwith the diazo solution and the formation of dyestufi is completed by the addition of about 200 parts of sodium acetate. The dyestufi is made into a paste with about 200 parts of water, while stirring, and converted into the ammonium salt with the necessary quantity of ammonia, then filtered, washed and dried, if necessary after addition of sodium chloride. The dyestuff is a red powder dyeing acetate rayon reddish orange tints. It corresponds to the foregoing Formula XVI.

Example 4 18.3 parts of 3:5-dinitroaminobenzene are dissolved in parts of hydrochloric acid of 30 per cent strength by heating. The solution is cooled by addition of ice and the cold suspension is mixed, while stirring, with a solution of 7 parts of sodium nitrite in about 25 parts of water.

A solution of 33.75 parts of the chlorosulfoacetic acid (phenyl hydroxyethyl amino)- ethylester (obtained by heating 18.1 parts of dihydroxyethylaminobenzene and 26.2 parts of chlorosulfoacetic acid in solvent naphtha. to 110 C.) in 200 parts of water. This solution is mixed with the diazo solution and the formation of dyestuff is completed by the addition of about 200 parts of sodium acetate. The dyestufi is filtered and washed until neutral. It is made into a paste with about 200 parts of water, While stirring, and converted into the ammonium salt with the necessary quantity of ammonia, then filtered, washed and dried. if necessary after addition of sodium chloride. The dyestuff is a red powder dyeing acetate rayon reddish orange tints. It corresponds to the formula:

OzN

CHi-CHTOH SOQH Example 5 10 parts of the first dyestuff of Example 1 are ground to a homogeneous paste containing 20 per cent of dyestufi by the addition of a suitable dispersing agent, such as Turkey red oil, sulfite cellulose waste liquor, sulfonation products of the residues oi the benzaldehyde manufacture. One part of this paste is intimately mixed with 10 parts of water of 50 C. and so many parts of a. concentrated soap solution that the dyebath prepared therefrom corresponds to a soap solution of 0.2 per cent strength. The whole is diluted with cold water to about 300 parts. 10 parts of acetate rayon yarn are introduced into the emulsion thus prepared and handled therein, the dyebath is heated to 75 C. within hour and dyeing is continued for about hour at this temperature. The yarn is then rinsed and brightened as usual. There are obtained fast vivid yellow shades which do not have a phototropic tendency. The appended claim is directed to the dyestufE used in the present example.

What we claim is:

f 8 The azo-dyestuflnf the T011110]! FOREIGN am Country I Date mnON 237,739 GreatBritain Aug. 6, ms V 5 434,126 GreatBritam Aug 23, 1985 738,079 France i h Oct. 23, 1933 FRIEDRICH OTHER REFERENCES ERNST REICH- Georgievics, Text Book m we Chemi'stzy, a e

9.4 (.1920). REFERENCES CITED I Georgievics and Grandmougin, Textbbok at The following references are of record in the Bye Chemistry, published by Sbott, Greenwood me of this patent: 818011. London (1920). i v Mel'dola and Stephen's/*Transactibhs or th j UNITED STATES PAIENIS Chem.SQc.,vol=. 87,1aage's 120543.

Number Name Date 525,656 Julius Sept. 4, 1894 ,735,961 Dreyfus h. NOV. 19, 1929 1,935,657 Mosby et a1 Nov. 21,1938

2,092,075 Knight Sept. 7, 1937 20 

